Read my Sparkplugs - 22RE

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JZiggy

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Changed the plugs on my 88 4Runner 22RE today. These are Densos that are a grade colder than stock due to some light pinging that sometimes occurs on the highway (EGR has been removed). They have 3 years and probably about 10k miles on them. Plug #1 is on the far right:

sparkplugs_zps6000cd18.jpg


What do the tea leaves tell you?
 
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Threads also had black anti-seize on them, which explains some of the residual crud.

Hot as in engine temps too high or combustion temps? I guess high combustion temps and lean go together -- fuel does a lot to cool the combustion chamber.
 
Non functional anyway and removes unnecessary wiring and tubing.
 
The EGR allows a small amount of exhaust gases into the combustion chamber to reduce the combustion temperature and (therefore) reduce Oxides of Nitrogen in the exhaust.

There was a myth years back, that it reduced engine power by lowering volumetric efficiency. However, the valve remains closed during WOT so in effect, it just tends to improve fuel consumption during 'normal' use.
 
Originally Posted By: JZiggy
Non functional anyway and removes unnecessary wiring and tubing.


Define unnecessary...don't think reducing pollution in any form as unnecessary especially considering you've had to modify the engine to get it to work properly.

If you can't get it working reliably I'll concede that can be a valid reason, there comes a point where cost is an issue. I am always of the concern that if it is present it needs to work.
 
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It's an offroad project truck. Doesn't get driven much. I'm not going to try to get the EGR working in it.

I expiate my non-EGR guilt by daily driving a Civic
wink.gif


Thanks for the input. Just wanted to see if there was a cause and if the deposits are within the realm of normalcy.
 
Can't see the pictures here at work but I'll throw my .02 in from my experience with those motors. The spring in the air flow meter on those are known for loosing tension and in turn starts to run on the lean side. Run a top engine clean to get rid of any carbon build up, adjust the air flow meter to run alittle on the rich side and run a hotter than stock plug. Wakes these little sewing machines right up. There's a few write ups on how to do this out there on the web. I recommend reading up on it on the Toyota bible on Pirate4x4 especially since this is your off road toy. You will find more info than you know what to do with over there.
 
Agree on the VAF spring.

Plugs look OK to me. Tough to judge plugs on street driven vehicles unless there is a really big problem.
 
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Originally Posted By: MrQuackers
My friend has 390k on the original engine, original head gasket. What is the record for a 22RE?


Probably a good bit more than 390k.

I got rid of a truck with a 22R at 500K, and I'd see the thing running on the road for quite some time after that.

Some people have claimed 1 million +
 
I've found that cold plugs reduce the pinging, but cost you a little in gas mileage. You're better off to use regular plugs and premium gas. It'll cost you about the same to run the vehicle, but it'll use less gas.
 
Good thoughts guys. Interested to try tuning up the VAFM at some point. The engine was rebuilt about 40k ago but the electronics are all original with about 300k on them.

Sounds like I should richen the mix and put the stock hotter plugs back and are where it takes me. Truck gets a consistent 19mpg running 33s, 4.88 gears, and a lot of heavy bumpers. It will be interesting to see if it stays the same after that.
 
Originally Posted By: JZiggy
It's an offroad project truck. Doesn't get driven much. I'm not going to try to get the EGR working in it.

I expiate my non-EGR guilt by daily driving a Civic
wink.gif


Thanks for the input. Just wanted to see if there was a cause and if the deposits are within the realm of normalcy.


Lol there ya go. One more reason to do this...
http://www.lceperformance.com/22RE-Supercharger-Kit-High-Boost-10psi-p/1073004.htm

Obviously cost prohibitive though.

I always see white & tan as a sign of normal running.
 
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